The VG algebra tope-graph reconstruction conjecture

Assume charR2\operatorname{char} R\neq 2. Let A1\mathcal{A}_1 and A2\mathcal{A}_2 be real arrangements. Their filtered VG algebras are VG(Ai)\operatorname{\mathcal{VG}}(\mathcal{A}_i), and their graded VG algebras are VG(Ai)\operatorname{\mathsf{VG}}^\bullet(\mathcal{A}_i). The VG algebra tope-graph reconstruction conjecture. If

VG(A1)VG(A2)\operatorname{\mathcal{VG}}(\mathcal{A}_1)\cong\operatorname{\mathcal{VG}}(\mathcal{A}_2)

as filtered algebras, or if

VG(A1)VG(A2)\operatorname{\mathsf{VG}}^\bullet(\mathcal{A}_1)\cong\operatorname{\mathsf{VG}}^\bullet(\mathcal{A}_2)

as graded algebras, then the tope graphs T(A1)\operatorname{\mathcal{T}}(\mathcal{A}_1) and T(A2)\operatorname{\mathcal{T}}(\mathcal{A}_2) are isomorphic. The conjecture would extend the result known in the supplied text for arrangements generic in codimension 22 to general arrangements; the supplied text gives no resolution.

Sources & referencesView supporting material

Primary source

Yukino Yagi and Masahiko Yoshinaga, “Reconstruction of oriented matroids from Varchenko-Gelfand algebras”, arXiv:2509.19905 (2026).

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